Door-buffer



O. A. LAWRENCE.

DOOR BUFFER.

APPLICATION FlLED 050.13. 1915. RENEWED NOV. 19. 1920.

1,394,420. 7 Patented Oct. 18, 1921.

IN VEN TOR.

gVITNESSES: I (J a 4 UNITED: STATES PATENT OFFICE.

oscan A. nawnnnon, or SAN FRANCISCO, cALIronnIA.

DOOR-BUFFER.

Application filed December 13, 1915, Serial No. 66,620. Renewed November 19, 1920. Serial No. 425,290. a

T0 aZZ whom it may concern.

Be it known that I, OSCAR A. LAWRENCE, a citizen of the United States residing in the city and county of San Francisco, State of California, (whose post-office address is 190 Albion avenue,) have invented a new and useful Improvement in Door- Buffers, of which the following is a specification.

This invention relates more particularly to preventing the slamming of the doors and the incidental disagreeable consequences.

In this specification and the annexed drawings, I illustrate the invention in the form that I consider the best, but 'it is to be understood that I do not limit myself to such form because the said invention may be embodied in other forms; it is also to be understood that in and by the claim following the description herein, I desire to cover the invention in whatever form it may be embodied.

Referring to the accompanying one sheet of drawings Figure 1 is a side elevation of the resilient buffer head.

Fig. 2 is a plan view of the same.

Fig. 3 is a side elevation of the same partially in cross section.

Fig. 4: is a detail in side elevation of the resilient buffer head.

In detail the construction illustrated in the drawing includes the inclosing casing 11, having the closed end 12 preferably drawn from a single piece of sheet metal. This casing is preferably rectangular in form. This casing incloses the spiral springs 1313. These sprlngs are held within the casing by the embossments or lugs lane struck upward within the casing from the bottom 12. The upper ends of the springs engage the lugs 15-15 formed on the bulfer head 16 having the shoulder 17 thereon. The shoulder .17 Slides freely within the casing 11, the lugs 1414 and 15-15 keeping the springs 13 in axial alinement within the casing 11 to prevent the springs chafing the casing, or getting out of position therein. The buffer head 16 is held within the casing by the downwardly extending flange on the retainer 19 frictionally engagin the inner face of the casing 11 with suflicient friction to Patented Oct. 18, 1921.

overcome the expansion of the springs 13-13 and holds the assemblage together. The retainer is provided with the lateral flange 1? overhanging the edge of the casing 11 to give a proper finish to the buffer as a whole.

The buffer thus assembled is adapted to be kept within the edge of the door stop transversely to the plane of the door. The buffor is so compact and unobstrusive that more than one may be inserted in the jamb stop for very heavy doors, or doors located in drafty places and liable to slam with Violence.

In instances where the frictional engage ment of the casing 11 with the bore in the .jamb into which it" is inserted can not be depended upon to retain the buffer, the retainer is formed as follows: This retainer has a flange frictionally engaging the inner periphery of the casing 11. The top flange 19 extends laterally a sufficient disdistance to provide holes to receive the screws X adapted to engage the jamb to which the buffer is attached. A further flange 20 may be added to the flange 19 at right angles thereto to receive the attaching screws X for further securing the buffer in place.

The buffer 16 is prefably formed of rubber composition having a rather stiff or tough texture to prevent the marring of the door stile where it strikes the buffer, yet having stiffness to retain its form so as to slide freely within the casing within the retainer. Rubber composition meeting these require ments can not be depended upon for any suiiicient amount of resilience, hence the introduction of the springs that actmore quickly and are much more durable than any resiliency compressible substance, such as soft rubber.

Having thus described my invention, 1 5' a shoulder thereon adapted to engage said retainer for limiting the outward movement of said bumper and a plurality of springs positioned between the bumper and the closed end of the casing of a tension insufficient to break the frictional engagement between the retainer and easing.

In testimony whereof I have hereunto set my hand at San Francisco, California, this 23rd day of November,- 1915.

OSCAR LAWRENCE.

In presence of- BALDWIN VALE" 

